Improvement in street-lamps



UNITED STATES PATENT OEETGE.

FREDEREOK HARTMANN, OF CHICAGO, ILLINOIS.

IMPRovEMENr IN STREET-LAMPS.

Specification forming part of Letters Patent No. 136,373, dated March 4, 1873.

To all whom it muy concern:

Be it known thatI, FREDEREGK HARTMANN, of Chica-go, in the county of Cook and State of Illinois, have invented a new and useful Improvement in Street-Lamp; and I do declare that the following is a true and accurate description thereof, reference being had to the accompanying drawing and. to the letters of reference marked thereon and being a part of this specification, in Which- Figure 1 is a perspective View of my improved StreetJamp. Fig. 2 is a cross-section 0f one corner taken 0n oo :o in Fig. 3, which is a vertical section of one corner of the main frame. y

Like letters refer to like parts in each iigure.

'.Lhe invention consists in constructing a lamp with a wire or light iron rod soldered in the sheetmetal angle, which forms the corners of the lamp-frame. The said rod extends down at each corner, is riveted to the socket, and thereby makes the 1an1pframe very much stiffer and stronger, a sheet-metal clip being also soldered around each corner rod for clamping the glass in place.

In the drawing, A represents the socket which supports the frame B of the lamp. The corner-pieces a of the frame are of sheet metal bent to an angle, and secured to the base-plate and top-section frame in the usual manner, the invention whereof I hereby disclaim. In

the corner of each angle-plate I secure, by soldering or otherwise, a light bar of round iron, b, extending the length of such angleplate, its lower end passing down through the base-plate ofthe lamp to the lower part of the socket, where it is attened and riveted, as at o, Fig. '1. Each rod thus serves as a brace to stiifen and strengthen the lamp-frame, and enable it to resist the force of the wind which frequently buckles and destroys the sheetmetal frames of street-lamps, as ordinarily constructed. The edges of the lamp-glasses rest against the rods or braces b, and by them are kept from moving laterally, being clamped in place by a exible sheet-metal clip, d, which is soldered around each corner-brace about mid-height with projecting ends, which are bent over the inner edges of the glasses, and thus keep them' in place. r

The corners of the top frame of the lamp may be stiffened by'silnilar braces, if desired.

What I claim as my invention,and desire to secure by Letters Patent',fis"- The lamp described, having .the socket A, rods b with clips d and corner-plates a, the rods b being so placed in the angle of the cornerplates as to hold the glass against the lateral movement, as described.

FREDERECK HARTMANN. Witnesses:

WM. H. LoTz, GEO. FERRIs. 

